Second, the earth gear bearings have to play an active part in torque transfer. Planetary systems split the torque insight from the sun gear amongst the planet gears, which in turn transfer torque to a world carrier linked to the gearbox result. The bearings that support the planets on the carrier need to bear the entire brunt of that torque transfer.
Or, in acute cases, they may select angular contact or tapered roller bearings, both which are created to withstand axial loads.
In planetary gearboxes, however, it’s a lot more difficult to create around these axial forces for two related reasons. 1st, there is typically hardly any room in a planetary gearbox to include the kind of bulky bearings that may tolerate high axial forces.
The existence of axial forces makes things completely different for the bearings that support helical gears. But it’s important to make a distinction between fixed-axis and planetary gearboxes. In fixed-axis gearboxes, the additional axial forces amount to little more than a hassle. Gearbox designers will most likely upsize the bearings to support the additional forces.
Since they don’t need to withstand any axial forces, spur gear bearings perform just a supporting function in the functioning of the gearbox. The bearings should just support the rotating equipment shafts, however they do not really play an active role in torque transfer.
Helical Gears Place Greater Demand on Bearings
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